Query Top Played Tracks Globally And By Country
Given a play_events table with columns user_id, track_id, timestamp, and country, write SQL to return the top N most played tracks globally and the top N most played tracks per country.
Constraints & Assumptions:
- Each row represents one playback event.
- A track can be played many times by the same user.
- The query should count plays, not distinct users, unless clarified otherwise.
- Use deterministic tie-breaking if the interviewer asks for stable output.
AI interview prep
Core dilemma
Efficiently aggregating play counts across potentially massive datasets, both globally and partitioned by country, while handling ranking and tie-breaking correctly.
3 tradeoffs and 2 stress tests locked
Interview prep
Unlock the interviewer X-Ray rubric, tradeoff matrix, stress tests, clarifying questions, and key concepts.
Query Top Played Tracks Globally And By Country
Given a play_events table with columns user_id, track_id, timestamp, and country, write SQL to return the top N most played tracks globally and the top N most played tracks per country.
Constraints & Assumptions:
- Each row represents one playback event.
- A track can be played many times by the same user.
- The query should count plays, not distinct users, unless clarified otherwise.
- Use deterministic tie-breaking if the interviewer asks for stable output.